Center-gage.



J. M. TORMEY.

CENTER GAGE.

APPLIOATION rILBD mo. 10, 1912.

1,096,769. Patent ed May 12,1914.

Jhn M. lrmgy JOHN IVI. TORMEY, OF CENTRAL FALLS, RHODE ISLAND.

CENTE-R-GAGE.

Speefication of Letters Patent.

Pateted May 12, 1914.

Application filed December 10, 1912. Serial No. 736,018.

To all wlom it may concern:

Be it known that I JOHN M. TORMEY, a citizen of the United States,residing at Central Falls, in the county of Providence and State ofRhode Island, have invented new and useful Improvements in Center-Gages, of which the following is a specification.

This invention relates to improvements in center gages and hasparticular application to a device of the class described which may beused as a center punch and scribe.

In carrying out the present invention, it is my purpose to provide acenter gage or punch whereby the center of cylindrical, square, andrectangular objects nay be accurately and quickly located and which, asin the case of retangular objects, may be moved along such objects toscribe the center line thereon.

It is also my purpose to provide a deviee of the type set for-th which'will embrace the desired features of simplicity, efiiciency, durabilityand strength and which when in use will function accurately.

With the above and other objects in view, the invention consists in theconstruction, combination and arrangement of parts hereinafter set forthin and falling within the scope of the claim.

In the accompanying drawing; Figure 1 is a side elevation of a gageconstructed in accordance with the present invention, the same beingshown as applied to an Object. Fig. 2 is a transverse sectional viewtaken through the center of the gage. Fig. 3 is a bottom plan view ofthe gage parts being broken away.

Referring now to the accompanying drawing in detail, the nuneral 1indicates the body of the gage or instrument, the said bodybeingprefe'ably composed of a rectangular bar of metal having theopposite side edges thereof provided with longitudi nally extendinggrooves 2, 2` and formed centrally with an aperture or Opening in whichis securely fastened a hollow shank 4 having loosely mounted thereon apinion 5 having the teeth thereof disposed within the grooves 2, 2.Secured to the upper end of the shank 4 is a boss 6 formed with a borecoaXial with the hollow shank 4: and through the bore in the boss 6 andthe hollow shank is passed a punch 7.

Slidably clisposed upon the body 1 at the opposite sides of the boss 6are jaws 8, 8

having the confronting faces thereof at the side of the body 1 oppositefrom that side carrying the boss 6 formed with V-shaped notches 9nerging into straight edges 10. Suitably secured to each jaw S anddisposed within the respective groove 2 is a rack 11 meshing with thepinion 5 so that in the movement of one of the jaws motion will beimparted to the other jaw. Thus, the jaws are spaced apart, at alltimes, equal distances from the center punch 7.

From the foregoing description taken in connection with theaccompanying'drawing, the construction, mode of operation and nanner ofemploying my invention will be readily apparent. \Vhen it is desired toascertain the center of a cylindrical Object, the jaws S, S are noved tothe outer extremities of the body 1 and the deviee applicd to theObject. The jaws are now moved inwardly along the body 1 and contactwith the Object at diametrically opposite points, the V-shaped notches 9adapting the gage to the cylindrical Object. The cer ter punch 7 is nowstruck a sharp blow by a hammer or other inplenent and punches a hole inthe adjaeent portion of the Object. Thus, the eXact center of the Objectis found. On the other hand, should it be desired to find the centerline of a rectangular strip or body of material, the straight edges 10of the jaws contact with the opposite longitudinal edges of such stripand the center punch is struck to indicate the center line of suchstrip, while by holding the center punch in engagement with the stripand moving the gage along the length of such strip, a longitudinalcentral line may be marked upon the rectangular body. To find the centerof a square Object, the V- shaped notches of the jaws may be cngagedwith the diagonally opposite corners of such' Object and the centerpunch struck a blow,

as will be readily understood.

I claim:

A center gage comprising a rectangular body having longitudi'allyextending grooves for-med in the opposite longitudinal edges thereof andan aperture in the Central portion thereof Opening into said grooves atdiametrically opposite points, a hollow shank disposed within saidaperture, a pinion loosely surrounding said shank within the apertureand having the teeth thereof working through the bottom walls of saidgrooves within the latter, a center punch carried by said shank, ja wssldably dsposed In testimony whereof I aflix my signature upon said bodyat the opposte sdes of said in presence of two Wtnesses.

enter punh, and acls carried by said JOHN M TORMEY' Jaws and dsposedwthn sm cl grooves and r engaging the teeth of said pnon WherebyWitnesses: the jaws Will be spaced equal dstances apart" J AMES KEOUGH,

from the center punch. DANIEL T. MURPHY.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Eatents,

' Washington, D. C."

